Sienna Miller Welcomes Baby Boy After 40

Sienna Miller, 44, recently welcomed her third child, a baby boy, with fiancé Oli Green, 29. The actress revealed the sex of her newborn, who arrived in May, sharing her joy and surprise at becoming a mother again after 40. Miller had previously believed it unlikely she would have more children, having made peace with having just one. The arrival of her son was a "euphoric" bonus, bringing her existential relief.

This marks Miller's third child. She welcomed a daughter with Green at the end of 2023 and is also mother to Marlowe, 14, from a previous relationship. Miller finds pregnancy in her 40s to be the best experience, contrasting it with her experience at 29. She feels more grounded and self-assured in her 40s, embracing a relaxed approach to life and motherhood.